#### Explanation:

To solve this problem we must first find the discount and then subtract it from the normal price to obtain the sale price.

The discount is 20% of $5.00. "Percent" or "%" means "out of 100" or "per 100", Therefore 20% can be written as $\frac{20}{100}$. When dealing with percents the word "of" means "times" or "to multiply". Finally, lets call the discount we are looking for "d". Putting this altogether we can write this equation and solve for $d$while keeping the equation balanced: d = 20/100 xx$5.00

d = ($100.00)/100 d =$1.00

Now that we have the discount we can calculate the sales price, let's call it $\textcolor{red}{s}$ by subtracting the discount from the normal price of $5.00 color(red)(s) =$5.00 - $1.00 color(red)(s) =$4.00